Since you looked, did your spoke break at a nick?
In any case nicks need to be fairly significant to cause breakage and will require many miles before causing failure. OTOH - the chloride inclusion I described earlier is purely a time related issue, and as I mentioned earlier can destroy spokes sitting on shelf.
An easy way to determine if chlorides caused the break is to look at the break itself. Normally the broken spoke end will be the same color as the rest of the spoke. If it's at an inclusion, it'll be black.
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